Carburetor



. April 7, 1925.

v. HEFTLER GARBURETOR Filed June 25 91 2 Sheets-Sheet l WITNESSES April7, 1925.

' V. R. .HEFTLER 7 GARBURETOR Filed June 25, 913 2 Sheets-Sheet 2-WITNESSES Mazda/w &

Patented Apr. 7,1925.

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MICHIGAN, Assmnon 'ro socrErE no cannon- T'EUR ZENITH, OF LYON, FRANGE ACORPORATION OF FRANCE.

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Application filed June 25, 1918. Serial no. 241,851.

To all whom it may concern:

Be it known that I, VICTOR R. HEFTLER, a citizen of the United States,residing at Detroit, in-the county of Wayne and State of lVfichigan,have invented a new and useful Improvement in Carburetors, of which thefollowing is a full, clear, and exact description, reference being hadto the accompanying drawings, forming part of-this specification, inwhich v Figure 1 is a side elevation of one form of my improvedcarburetor.

Figure2 is a plan view thereof.

Figure 3 is a sectional view on the line III-III of Figure 2, and

. Figure 4 is a detail sectional view on the line IVIV of Figure 3. v

This invention relates to an improvement in carburetors and is designedto provide an eflicient device which can be readily and inexpensivelymanufactured.

One of the objects of my invention is to so arrange theoil feeds that Iam enabled to "overcome all joints and plug openings between the inletsto the fluid feeds from the constant levelchamber and the outletstherefrom. I accomplish this by forming the oil feed openings in thebody of a main casting, and form the atmospheric well and the emulsionchamber within a stem which extends from the main casting and which issurrounded by the bowl which forms the float chamber. Another object ofmy invention is to so form the emulsion passages within the main castingthat I am enabled to give a substantially straight main air passage fromthe air inlet to the intake pipe for the engine'; Another object of myinvention is to so place the stem, in which the atmospheric well isformed, as well as the main jet and the emulsion conduit, that the feedsthereof are substantially at the centerof the float chamber, whichenables'me to keep the gravity head for the jets when the device is inan inclined position, very near the value of said jets when thecarburetor is in its normal position. A still further object of myinvention is to provide an air adjusting device for the slow-speed jet,

which is so arranged that adjustments can be made while the engine isrunning.

The precise nature of my invention will be best understood by referenceto the accompanying drawings, which will now be described, it beingpremised, however, that the reception of the fluid feed pipe.

outlet. therefrom .is a casting 19, the

various; changes may be made in the details ofconstruction and thegeneral arrangement of the parts without departing from the spirit andscope of my invention as defined in the appended claims.

In the accompanying drawings, the reference character 2 designates themain or body casting, which is provided with a stem 3. This stem 3 has avertical opening 4 therein which forms the atmospheric well, as well asan opening 5 adjacent thereto and parallel therewith, which forms theemulsion conduit, or conduit in which the minute globules of fuel areheld in suspension during the operation of the carburetor to provide. 'acombustible mixture. It is this mixture of fuel and air which isreferred to as forms a float chamber 7 This bowl may be formed 'of astamping or spun up. from sheet metal, and is held in position by meansof a spring 8 secured to the top of the casting and provided .withfingers 9 which engage notched cars 10 connected to the rim of the bowl.The notches are formed with depressions for the receptionof the ends ofthe fingers to lock the bowl in position on the casting. The castingflis provided with an inlet opening 11 for The leading into the floatchamber iscontrolled bymcalns of a valve 12, which is adapted to close aport 13. This valve12 is slidably mounted in a sleeve 14, which has athreaded engagement with an opening in the casting, the port 13extending through the sleeve 14, and communicating with the opening inwhich the valve is seated. Extending downwardly from the casting 2. andwithin the float chamber 7 are lugs 15, to which is pivotally connectedat fl0at'16. '17 is a lever extending, from the pivotal connection ofthe float which engages the valve and is arranged to move it to itsclosed position when the.

termined level.

The upper face of the body casting 2 is machined, and secured thereto byscrews 18 upper end of which is arranged to be secured to the end of theintake pipe leading to the engine. This casting is provided with athrough openin 20 which orms the mixing chamber, an mounted "therein isa primary venturi 21. 22 is the usual throttle valve rotatably mountedwithin the mixing chamber. 23 is the air intake pipe which is secured toan'annular seat on the casting 2, and rotatably mounted therein is ashutter valve arranged to be actuated b the lever 24. The main casting 2is provi ed with a spider within the air chamber which forms a supportfor a boss 25 having an annular opening therethrough for the receptionof the small or secondary venturi 26. 27 is an annular chamber withinthe boss 25 and surrounding the secondary venturi, which is incommunication with the secondary venturi by means of a plurality ofsmall radial openings 28. This annular chamber 27 is also -incommunication with the emulsion conduit 5 by means of a conduit 29. Theconduit 29 is formed by drilling through the wall of the support 25, andthen plugging the opening in the support 25, as shown in Figure 31 30 isthe main jet within the emulsion chamber 5, which has a screw-threadedengagement with the Walls of the emulsion chamber, the. lower endthereofbeing provided with a calibrated opening 31 for ceding gasoline to themain jet. 32 is a plug having a calibrated open- "ing therethrough, andwhich is mounted in the stem 3, the calibrated opening bein arranged tofeed gasoline from the float c amber to" the atmospheric well, and 33 isan opening extending from the atmospheric well into the emulsion chamber5. 34 is an air opening leadin from the atmospheric well into the floatc amber.

The casting 19 is provided with an outwardly and downwardly extendingarm 35 having a vertical opening therein and a transverse opening 36communicating therewith and with the mixing chamber, to form aslow-speed jet. The vertical opening in the arm 35 is screw-threaded, asindicated at '37 for the reception of a threaded plug 38.

The upper end of this plug is tapered and is arranged to form a valveadapted to be moved toward and from a conical seat 39 in the verticalopening. 40 is an air opening through the wall of the arm 35 foradmitting air to the vertical opening below the seat 39. This plug isalso provided with a tube 41 which extends a point adjacent to the lowerend of the atmospheric well 4,

while the upper end of this plug is provided with an openin throughwhich the gasoline passes to the s ow-speed jet 36. Rotatably mounted ina cut-away portion of the arm 35 above a brace 42.is a bushing or collar43. This bushing serrations w ich engage corresponding projections onthe plug 38,. as clearly shown in 43 is. provided with internal Figure4, the arrangement being such that when the collar 43 is rotated, theplug member 38 will be moved toward or from the seat 39'to adjust theair feed to the slowspeed jet 3.6. The periphery of this sleeve is alsoprovided with serrations which are engaged by a spring-pressed plunger43,

for lockin the bushing 43 andthe plug 38 mospheric well therein as wellas the emul-.

sion'chamber and main jet, and which stem extends from the main castinginto thebowl forming the constant level chamber. Furthermore, from theprovision of a structure in which the bowl forming the constantlevelchamber; surrounds the stem and is removably secured to the casting.Bythis arrangement, the bowl can readily be removed from the maincasting and all of the gasoline drained into the bowl, and afterwardsany adjustment or removal of the calibrated opening nuts can readily beaccomplished without removing various plugs to gain ac-. cess thereto. Astill further advantage results from the provision of a carburetor inwhich the main air passage is substantially in a straight line. Alsofrom the provision of means for readily adjusting the air feed to theslow speed jet during the running of the engine.

I claim:

In a carburetor, a main body section, a float chamber secured against alower surface of such body section, a gasoline inlet leading downwardlythrough the body section to the float chamber, a projecting portion onsaid main section having a channel therein for deliverin fuel to a fueloutlet, a stem projecting ownwardly from said main section having a fuelwell formed therein, a secondary body section fitting against said mainsection and having a mixloo ing chamber formed therein, a fuel feeding

